ISSN:
1615-6102
Schlagwort(e):
Cytoplasmic inheritance
;
Organelle distribution
;
Preferential fertilization
;
In vitro fertilization
;
Zea mays pollen
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Summary Five isolatedZea mays sperm cells, taken from the same population as used for a previous morphometric study, were serially ultrathin sectioned and computer-reconstructed to yield three-dimensional images as well as quantitative data. All cells were found to be essentially spherical and to contain a full complement of cell constituents except plastids and microtubules. The nuclei of three cells were highly curved into a “C” or “V” shape while the other two nuclei were not curved, but were more spherical to disc shaped. The three curved nuclei were heterochromatic in appearance, the other two were more euchromatic. Mitochondria were closely associated with the nuclei, were predominately in the form of large, variously shaped complexes, and ranged in number from 7 to approximately 74 per cell. Dictyosomes tended not to be close to the nucleus and ranged in number from 6 to 23 per cell. The endoplasmic reticulum was similarly not typically associated with the nucleus, and varied from extensive sheet-like areas to small membranous whorls. In addition to confirming the findings of previous studies on isolated corn sperm cells and providing new three-dimensional and distribution data, the results of the present work underscore the existence of a high degree of morphological variability amongZea mays sperm cells of a population.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01353997
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